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The time it takes for a Cepheid star to go from it's brightest, to it's dimmest, and back to it's brightest again. =] Hope that helped.
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How are Cepheid variables related to the instability strip?
Cepheid variables are high-mass, pulsating variables exhibiting a regular relationship between the period of pulsation and luminosity. When a star's evolutionary track carries it through a region called the instability strip in the HR diagram, the star becomes unstable and begins to pulsate. These stars are important to astronomers who study galaxies because Cepheids can be seen at extragalactic distances, and their period or pulsation tells us their luminosities, which in turn tells us their distances. - Cincinnati
What is a Cepheid Variable?
A Cepheid is a member of a particular class of variable stars. The relationship between a Cepheid variable's luminosity and pulsation period is quite precise, securing classical Cepheids as viable standard candles and the foundation of the Extragalactic Distance Scale. See related link for more information
What is cepheid phase?
A cepheid phase is when a star starts expand and contract and it loses its outer layers in the process.at least that's what i was told.
A star that explodes temporarily increasing its brightest?
binary star
What was the scientist Henrietta leavitt famous for?
She discovered the period luminosity relationship of cepheid variables
What does Cepheid mean?
A Cepheid is a member of a class of pulsating variable stars. The relationship between a Cepheid variable's luminosity and pulsation period is quite precise, securing Cepheids as viable standard candles and the foundation of the Extragalactic Distance Scale.
How are Cepheid variables related to the instability strip?
Cepheid variables are high-mass, pulsating variables exhibiting a regular relationship between the period of pulsation and luminosity. When a star's evolutionary track carries it through a region called the instability strip in the HR diagram, the star becomes unstable and begins to pulsate. These stars are important to astronomers who study galaxies because Cepheids can be seen at extragalactic distances, and their period or pulsation tells us their luminosities, which in turn tells us their distances. - Cincinnati
What is a Cepheid Variable?
A Cepheid is a member of a particular class of variable stars. The relationship between a Cepheid variable's luminosity and pulsation period is quite precise, securing classical Cepheids as viable standard candles and the foundation of the Extragalactic Distance Scale. See related link for more information
Which variable stars have pulsation periods between 1.5 hours and 1.2 days?
RR Lyrae stars. (Sometimes these stars are classed as a type of "Cepheid variable", but they are usually considered as a separate star type.)
What is cepheid phase?
A cepheid phase is when a star starts expand and contract and it loses its outer layers in the process.at least that's what i was told.
How do you calculate the distance of nebulae?
There are many ways to calculate distance at huge scales. One popular way is using a Cepheid within the nebula. A Cepheid is a very luminous variable star (a star that changes brightness). The changing of brightness tells us a lot about the distance by measuring the period (time) and the luminosity. See the related link for more methods.
Why are pulsating variable stars useful for finding distances to globular clusters?
It really depends on the type of star, but for certain star types, there is a relationship between the period and the absolute brightness, so if the period is observed, the absolute brightness can be deduced. Yes. It seems like this question is about the Cepheid variables.
A star that explodes temporarily increasing its brightest?
binary star
What is a star that appears to pulsate?
The general name is a 'Pulsar'. The reason for the pulsation may differ depending on the star system.
What was the scientist Henrietta leavitt famous for?
She discovered the period luminosity relationship of cepheid variables
How bright is a Polaris star?
The main star of the system is Ursa Minor Aa which is a Cepheid Variable. Its apparent magnitude averages at 1.98
What is the apparent brihtness of the polaris?
The apparent brightness of the main star in the system is 1.98 but remember that this is a Cepheid variable.
